.checkbox {
  display: block;
  width: 94px;
  height: 27px;
  overflow: hidden;
  border-radius: 3px;
}	

input[type=checkbox] {
  display: none;
}

input[type=checkbox] + label {
  text-indent: -9999px;
  display: block;
  width: 150px;
  height: 27px;
  line-height: 27px;
  background: transparent url(sprite2.png) no-repeat -56px 0;
  -webkit-transition: background-position 0.3s ease-in-out;
  -moz-transition: background-position 0.3s ease-in-out;
}

input[type=checkbox]:checked + label {
  -webkit-transition: background-position 0.3s ease-in-out;
  -moz-transition: background-position 0.3s ease-in-out;
  background-position: -3px 0;
}